单选题I__________have been there,but I__________not find the time.
单选题Very few of our birds stay with us the year round.Some come to us in the winter from the cold north.Others come from the south to spend the summer with us.How do they know the way Suppose you were tol
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单选题（ ）
单选题从1,2,3,4,5中任取2个不同的数，这两个数都是偶数的概率为（ ）
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单选题毛泽东的诗句“金沙水拍云崖暖，大渡桥横铁索寒”所反映的历史事件是（ ）
单选题下列各句中，有语病的一项是（ ）。
单选题图中所描绘的地质构造应为（）。
单选题Our eating habits are very important for good health and a strong body.There are times when most of us would rather eat sweets and ice-cream than meat and rice.Sweets and ice-cream are not bad if we e
单选题从1，2，3，4，5中任取2个不同的数，这2个数都是偶数的概率为（ ）
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单选题19世纪中期，美国为发展资本主义，兴起“西进运动”，在此过程中（ ）
单选题过点P5，0与圆χ2+y2-4χ-5=0相切的直线方程是
单选题Enough sleep is important to health.The amount of sleep（21）depends on the age of the per-son and the conditions in which sleep（22）.The young may need more sleep than the old,hut（23）eight hours are eno
单选题“几日随风北海游，回从扬子大江头。臣心一片磁针石，不指南方不肯休。”这首诗的作者最有可能是（ ）。
单选题Enough sleep is important to health.The amount of sleep（21）depends on the age of the per-son and the conditions in which sleep（22）.The young may need more sleep than the old,hut（23）eight hours are eno
单选题若a,b,c,为实数，且a≠0.设甲：，乙:有实数根，则（）
单选题请选出下面划线部分读音不同的选项
单选题抛物线的准线方程为（ ）